Date: 19th of November 2025
Rating: ★★★★★
Entrance: 2.1m
Materials: Concrete, Redbrick, Bluestone
Shapes: Round, Box, Arch
Right at the start there is a fairly deep GPT before quickly coming to a bluestone arch.
For a while the drain continues as a bluestone arch that occasionally gets wet before shallowing out again.
There are a few bluestone offshoots in this section but majority look to be filled in or too small. Some parts of the drain have this concrete cladding on the sides, which I haven't seen on any other sections of bluestone arch in victoria.
At the end of the bluestone section comes a newer concrete junction room. Upstream up the new RCP leads directly to the new ocean outflow.
The drain comes to a split where the left continues as the redbrick topped bluestone arch, and the right a newer redbrick pipe. The new pipe would have been built sometime in the interwar period as a diversion for the much smaller and older right tunnel.
The older tunnel has some stranger shape changes compared to the new section. Some sections have had their roofs replaced.
Towards the end of this part there is a pretty low redbrick arch section that spans under a rail line. This would have been a bridge before the drain was put underground.
The newer split has a few grille rooms and shape changes before coming out to the main drain again.
One of the strangest shape changes is this RBT topped with corrugated iron. I believe it is only seen here in Victoria.
These redbrick arch sections are most likely the oldest sections in the whole drain. They are also the only two sections of any other material than concrete.
Both used to be bridges, the first a bridge for a road and the second a railway. Both are pretty short at about 20m long.
One of the only exits in this drain requires you to climb upto this gutterbox.
The last real feature is this old section of redbrick topped bluestone. This used to be an old bridge over a main road before the RCP drain was extended out this far.
